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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d1dcfcd5dcba372c598fea9ae3f42e9de63f2815d55ccabc632c57a0a16d82f' 
  AND token = '/XQdOBW7QN3ruFN44g9OSGt1+cjZJIHsCei9oNslcVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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