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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68aaca6aa183b0496bc3a827a9445a5313d6e64d73cf509ac6ed4df81ddc3993' 
  AND token = 'vsdHuL73RFJi8N6zdZVG4NgPKxM9S7wHUsEaM2+T0x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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