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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4d44a9dfabe0dbc00d2140f7f55a0738271136809b37801e004e92e96d4841' 
  AND token = 'fK4voNhrqydVK94KoZOA7h+9u3OOFkZlKTdEKzQZMXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00683

JSON explain

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