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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55d32e4735614ef707c915ad26ffdfeebb3aa35c32cbd6805e676b7962906f4' 
  AND token = 'jLDEV307Lc12W/uQfNisC7Y77dzZS/F7sVYSYfP0ZbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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