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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd871a9c5901fc688a4fa5258e51316878e289de76c0a9fb68e939b22a019fb58' 
  AND token = 'g3Rxzribxb8TptHr29dL+oXQGxnYU9/gp5wO3MLdI20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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