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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7efd9be68d89857c5f4097652b3507127ac7ed6a570f7dbf44d803f06aa44506' 
  AND token = 's74JlOoBiTveoWEjh2S61EzQMAzIL5fIDb4Q/6YD4j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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