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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009040d3fde49cda33e9627c1877c7bf9177e22727c3e44f1d2a5f88c1deccb2' 
  AND token = 'y1pjEdmxxhSWgF8HZMhE9GMdkdph6Z67xx6ZToFSbX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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