SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683657fd605b8cfe7ade6947825bf394fdd5a8a5e08204020489d35a51429329' 
  AND token = 'Qs38T3F6HbHILeJ5smv6zaUzN/+rUjlZ5q69XYd8nVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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