SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72b23998a4d5dee896ab78aa6ef3b9f1bf63c787bfcd9c5e40a14d665e527833' 
  AND token = 'Lw1X1sYpYs2gKe/jPKqnFYoXljdki+GWJqlht/JXTiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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