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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e3001833547ddf36c6db4147974657a40737a1f433362557c12cb019a7fb22' 
  AND token = 'FU9sSXu8xCSuFFaHuhJmT5eVkS+61ppOpapUqV7sIDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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