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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1db797ad8f28627c572089e6c75ea030edfc40307d3b0c2e5d68ff705b81810' 
  AND token = 'gN7L6ojC2vmwbjTGNLOh4SwirVbl9IUHZ55tIb21E50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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