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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e1e6c5bdc952ce9e65829d072a37b4962e6c0c7aa872f9a278fa8db037c255' 
  AND token = '5w7nHAZaKszP3mw/TkXX0bD/sG5sna8AQ2wYvYrJtj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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