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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9459ebef01cf1b53b2b56f35ea28f96b1e6d79aded4eb258175089ad7e94a2' 
  AND token = 'w0HiCNLteyUXPY43OjNNOwKqNjtrYZmSzD2tpZKOMvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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