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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f05ab4c390da0e1b7f1861b3c5a8ae88d5bcd27697c6ee4bd47bff182413b3c5' 
  AND token = 'Vz7FquLpruMcEZgFKbmQoNrtM1TLZDgsx4avep3Ft8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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