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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7701e40bd5397f2c7e706abb8390de4726169bdcd6f4e8022a77b6550d534b55' 
  AND token = '8IoJkZ23kr6Cfjkgqt61TXb34+3kpxhJz1ZeuFJj41s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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