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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25e622c23be817b195435050e98946ad668811833140312a4041d94ba912438c' 
  AND token = 'YNuyn10jejyNZd+/1tT/hmtkyxx/tSSjU626aoRj/UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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