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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d4e41110c0eda16a74b1f834f7bf084934368d8422b025f0fc954fd7e12bbbe' 
  AND token = 'Qak+UsItYAq0arAXTpVagUfM8Akq3EpFNcrRVNHjVDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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