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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e00af60bd5f212cd21408509378678902194cc0dab8b5afc56c4c4e230bce1' 
  AND token = 'xELku1MgjzWVRFIwfEmwHF8tPj4qJkRy5Kg+31Wds9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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