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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc42fe5e15fde3aacd10dc64a7eb40326e1f9671794aaf06e932ef8011f21e93' 
  AND token = 'jnSJu69TF70IR76kXUvtPnr9s+uZQbj9F0ZCzUmq/iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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