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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba9c96fa57725fa8668da105215e9724147b8b6a58d5f033d4dfccd0dcebcdc' 
  AND token = 'gaiqax5iU9ZQmp7Aw3XydCo8Z8a8UY8ddTqq6CxBsrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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