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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cef2edfb3aa655a9afe64cee7e6407958a91980b6f899c5d0035692370bf147' 
  AND token = 'TYqHQ/7zHel1kdJGDRxdpf5r9K49dZ8yO7CkLjbtrYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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