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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b81903e5a3a7a78e3feac6245d7dcd090b8bf0fe61a6a57862817bb0003ac6' 
  AND token = 'yrl6Px0mCGNcvDK9UTT1KTUWHM79NLrsyIPH6v+DlLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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