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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c409d68e5b96477146e6a9e77290be300fc33f5ba89f83c4a94577c9c383c333' 
  AND token = '/wJlf9wDpsWkMAQxXXxHpkjPR574eVylle1vq0qFDRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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