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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f891bc205bd15b99fb99993706ea610d584317f2bed38ab1b470a71c181cf07' 
  AND token = 'lB7NJsROFtitqONPRmEQFGaMW22DJ4pAS0YudnlJPl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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