SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb554c14cb04333d0b171452b4dd93de4b446b9f26e538f883bf080587b4613' 
  AND token = 'sDtgnKvDVjsO2gsosw+kIRCU/BZ3QWGW5F7DqRLe8Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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