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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4736aa284b98944610d9998e430241b1f912de85312de8a2200481cf47c376ee' 
  AND token = '7YTyjt35RzLQ0fsLse1G7R/9hPkZethHjpNZTyXycsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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