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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58867706ed1400b462a8e13afef95972d70ea67ead557c81430344c67fac3ace' 
  AND token = 'Nxubr5lL680volhkOFrWAn+OO/fRjn9YbDetZhQfFp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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