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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3c6ae5916ab80a555d11800463b2962398dea39402a1ae64425f4f549c3f49' 
  AND token = 'B8Hz60qPJDmUjtt/AQZecMBwwOkvNAniTXiQic6UhEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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