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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4762ac00b21290382903643fdeddf29a0a2f6d607756d388fcb3127905228209' 
  AND token = 'By7VTG4SaTuAJQujQEd8i79ofY7SZJd5MHgsYcAPpYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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