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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9214ea30f99cb1873d561ff6e304915c5af597268d8fde9f5b2bf622b2694635' 
  AND token = 'broM9WvY84sbHiuSwRHDwM83ughOo42EOAPse9oV3XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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