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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e934795b09faac8fec0a116e63df957d6b408f70ae308ab28af3e07cea011ba3' 
  AND token = '7mfQ9GkJGStroWSwiLuipqTAqCJi/8ll2DhHDv21AgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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