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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f0149b650c356c34e740ac3a05c0a03addfa6ae3c5c06919ea5f3fb56b6d2d' 
  AND token = 'FtEf7MDnoqwCmThsWG6lspnjMBBl4ZichwKPnYOoSeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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