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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c577c5fc7a6e147399d08686405dd8c879bbd4aefb805ef24073697ef6934a' 
  AND token = 'xikqAL5T30j4wdqRUtWSFkQrg+SFY+3U/+IY5C1C5NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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