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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840d9590c38f54a5e059a2c78975b89e9a19df4da41221b5aa9fdf766a76860b' 
  AND token = 'j21RJCHAe6NvKRSRIMb8T6SCnaAdBZBhRRc2OQ1kbLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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