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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7ebc1dfe33d32008bed4e406ab23f9f93c117f7554aeb8a1ae443e4fdd49c8' 
  AND token = '+ZoBzc/L5AmcU5lH2R85TktT9PokDwWvRP6KfaSPyW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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