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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f03f93f692193ff994165cfc2d1f428a0cb5ebdf6ed3966975a8cd870b345add' 
  AND token = '/8yQx1PKGxjcbUgo3KAC3mhgbrtuoMSL0yzCqK8c4/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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