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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f70b331a0ae5fb292d4ac930b2e6a99a4c8b613d991c944030617da9fe2191' 
  AND token = '1o89ISsaIPdsKD9bm0ou8Il/UKdnlMskF6J25L7y8vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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