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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3634fd59dcaea33e56901db13ffee7bee41684976bdc0fc89403c64bf58d428' 
  AND token = '+q0t9u1+S7CQBdM9RjOfEdOEPY4ZEehBTnZpsRK5rJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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