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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef854d493deec512d252ad4009c6f25e4bc5cb421bfd903874b54b9498c046c5' 
  AND token = 'WpE6j/evwrP+xWpW+tjk9a8QrG29kJpIxYFmccENlaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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