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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47abee12d82be1bfb2b3b9a20ba1f74fbeb892ca92d66eadbc99f748c88d56b2' 
  AND token = '6FBbD0HZv+X9yhmeuOcm7vZILMGBG9qBBcwLkYm/Q0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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