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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bddafbf36962e41572c3c4f6e0e1796f02a5ff5f35f4ba81264f785033f579c' 
  AND token = '7C0j4pkdaruN946h4sChs5mXtWljNQcZnHIJgBSitqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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