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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1dfc92a12937136c278ec8be10de1bb2d6b23723e46c9d5d2315efbfab11f02' 
  AND token = 'M6/sJz7zOusVO1NgTCBVMu18DPV/dHfHRAFzO/p+t7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}