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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f22058a6866a268ff4382e5aebe6df5fed961831c32f6aed0f30affddc13f5' 
  AND token = '1RBaBpyRuekHbYwtgU2UfBz7RB9Y0a8D2zUwubv7wi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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