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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7624121b1de17426a10b86fc546f6a8b777c76fd80b7c1b683a297e6f984b1' 
  AND token = '6ktAxN6DJhnelRJgMjWkIDb8vYcfDaUdr3uL/JJqofk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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