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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f04f1696cddbc8af65e377d228028fbbf6b7ef68f1833d907cdf3095a12404e' 
  AND token = 'XuoyQweZnxMjZU5RsT5ooNH1tDTs/tz70SCkMbW8QNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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