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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531b5fa660c463e4f0c52c9e1f30fe20cf5473ede97d086c13bb614359d9b202' 
  AND token = 'QZy427BIAPd1xLMNIzQXH6F5NrdkAq51IEpJ9Els+8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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