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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af194bf7bd4a5f81a34aecdf46601577ef6afd6cf7a7c4535e3c3740c85b39c2' 
  AND token = 'AZ2/vY9jLDHN5zQdgQUAwIfgDuUtLRfF4cBpT8fXyOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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