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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5747987cb77d5cea88f9214adf881590671655e35ee4d86c95075f7e55009e' 
  AND token = '7xJ+DJUILcqQr35AyUx0LvSqMB8bTWqKm29QbKBKfEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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