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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c79e0ec04010891dc60e74ada68c6694f1f771a049721fa1e8ba535b3b58be' 
  AND token = 'qA7jvxS5mWEpQBDio2ackkp1jikTJ3rVE0QhrwF4HzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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