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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b831f21ac5ae5a1d2de423b33132cca00c85b50173f16c7c67e1455e54ac125' 
  AND token = 'mhrn5l5rslQz5f3LCBI2YuDvf5evpqbvQyz1qnDrfvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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