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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a475a60eaed514d50a819228d5cfa19f6ed700877855f855b2cf4eec706edbce' 
  AND token = 'B5gI195jdMryYSQXAZKwrgHqrg9KXG94URxMHi1OxAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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