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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bfc23629ec89b1716a168e825c089691d2166f5a908365c2789575eab205bc2' 
  AND token = 'lWhVXsRf0zosPOBQA4EW71bsnOydW2Ev3LCQiUW0AZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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