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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941298f035531abd2916d1188fa52b5eb98bafe7f390ff20916cee1417a462e5' 
  AND token = 'GaW2yRLxx7txo+FyKfectagEn7IGpmqT+hGb9TicIUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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