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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d42fbec8d1b40bd6bd401300dc572821eee454697c82350514fa408cdc7b1ab' 
  AND token = 'Yjm0tVGRAuc4v2IldUQntS9El8sRY7lISK/xE8Za+N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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