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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f2817c99382e0596eb75321c8b9d2c76a060656609466940dcd16ae9cbd7219' 
  AND token = 'wnWex3YQ/E+8nbpxKxL4t68MWKI7iGxMIU6xxUaAvwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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