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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f5d8bc9b7f80f243db69842d5aff9225a58d991459fa32e9e213515addca4c' 
  AND token = 'v+193d9JCttCBoSkDfoYt7EwIcpFQUvlJ8+mh5roYYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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