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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc4f754ed8c4aa3d05d434c6967c44963dfa2558dade5202b1be7b98637376ec' 
  AND token = 'CfhIh3nYIJoxlrpUAQVPaD1PPrUlY0ak8WmHPwcPUnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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