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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c01bd37e4be38921957212c30888e480abe5aa4511c0c9f14bdb668534cc809' 
  AND token = 'xSwYHV/C5xrWsxFj9XcFa7kUFfm85VUIRUi6bJtB4Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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