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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd8e6492f15555fb13166e25bde6aab92b3382913010cc2b398c1707d777bb0' 
  AND token = 'SkYmsRuOxlRNqZFjDrSN9yemwflub8+gnJD4Lwxwx6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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