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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf357a503a35bbb83a38bd9a3828c3c9de693b56e509734271ca0fd7f3cee66' 
  AND token = 'oN4eoFyaBDIBd0C4tyO16JYct5ZjKheKojEst9t9Ovg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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