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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac76cf76df62ad56efcc71de2861f5018db7b8dcd137329f0807e160a44d7606' 
  AND token = 'SNluIc51sV9vAyx2QNCM7pvKbSlDoFEj7CNQFbQN80E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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