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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f636fa2433c0ab17b1016e9cbaa0a6c927c3d09650ac452dddacf1d870b4acb7' 
  AND token = 'z7gEBntDlzs+YBhE41BVmHpfICopdVIiJz1do2a/30g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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