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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2844f7123fb6a5aad07494ed341720794406a3663a9f33f86e0edec98aeff078' 
  AND token = 'M7QPyvLkOb5XnP6XyYuUx/DdGGbdoIliYeckJ9QEJVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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