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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b903e45bb55227a20da79fa59caed93e939b43f016953ec8448043735ddf6946' 
  AND token = 'uPJSmzE81R+D6M5VbZB9VGVdk/NammEsn6ZcQKlekp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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