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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed219bd22d9caab83f162e12e2e7ebb6fc1b9c13996a775e1cc40ed5b309ee6' 
  AND token = 'uDRcctReJek8u6z15ifywODdrPEzTw3qOXvdx3Ks9wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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