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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66ef10fb00457696c5bda74596703160a77eb1ec70f3d1dbd984573ad707dd94' 
  AND token = 'qAJRNtpeC/z2JXeZxFSWB0q3wWaQpAH6ByaoJ44qmcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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