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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01fa684b009672cbc4211a35f86fbf67225f0cff987a368600c3e673c08a1355' 
  AND token = 'RSjybMKigTqKciwJ0Wza2IP/CRadxdtjmhn38QxtsBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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