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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '741a76563d0f798063faa1bbc3897ebd1e8c61abff23afe0c72f5cdfc786f5c0' 
  AND token = 'RRfN6Zo26M8f8aJ7VIUh3P08q607eY4agZW5ZzbWfzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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