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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46d94719185473916886634319d9f3d915002dd109ab6b57675a0096ef08a352' 
  AND token = 'S8jQ+g32Xed98D/dfJp/l2fjab3dpvFe/p59eWHwYIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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