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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a1bd03cd8a35e6ec518c80aade9978709207804de1bb2534c77eadfead9586c' 
  AND token = 'WOoCZ1oFTiQWkXI9eG6AxWNwTLxCHhWvE03QqAOamxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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