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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '434d55dbc616e58d42fb50c2acf0643932145da2a5f8ef4c9d160be5bc4e7ecd' 
  AND token = 'gfm9KywwZtaDd1DaJRpukGvkpt9JKrBsE7X8joxkWI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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